Quantitative Aptitude - Arithmetic Ability Questions

The variance of a set of data is 121. Then the standard deviation of the data is

Determine the value of a/b + b/a when a + b = 8 and ab = 4.

Find the value of p if 3x + p, x -­ 10 and ­x + 16 are in arithmetic progression.

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

At what point does the line 2x - 3y = 6 cuts the Y axis?

What is the reflection of the point (1 , 2) in the line y = 3?

Two trains are moving in the same direction at the speed of 42 km/hr and 84 km/hr, their lengths are 320 metres and 380 metres respectively. What is the time taken (in seconds) by faster train to cross the slower train?